Avalonia/Perspex.UnitTests/Styling/SelectorTests_Descendent.cs

// -----------------------------------------------------------------------
// <copyright file="SelectorTests_Descendent.cs" company="Steven Kirk">
// Copyright 2014 MIT Licence. See licence.md for more information.
// </copyright>
// -----------------------------------------------------------------------

namespace Perspex.UnitTests.Styling
{
    using System.Linq;
    using System.Reactive.Linq;
    using Microsoft.VisualStudio.TestTools.UnitTesting;
    using Moq;
    using Perspex.Controls;
    using Perspex.Styling;
    using Match = Perspex.Styling.Selector;

    [TestClass]
    public class SelectorTests_Descendent
    {
        [TestMethod]
        public void Descendent_Matches_Control_When_It_Is_Child_OfType()
        {
            var parent = new Mock<TestLogical1>();
            var child = new Mock<TestLogical2>();
 
            child.Setup(x => x.LogicalParent).Returns(parent.Object);

            var selector = new Selector().OfType<TestLogical1>().Descendent().OfType<TestLogical2>();

            Assert.IsTrue(ActivatorValue(selector, child.Object));
        }

        [TestMethod]
        public void Descendent_Matches_Control_When_It_Is_Descendent_OfType()
        {
            var grandparent = new Mock<TestLogical1>();
            var parent = new Mock<TestLogical2>();
            var child = new Mock<TestLogical3>();

            parent.Setup(x => x.LogicalParent).Returns(grandparent.Object);
            child.Setup(x => x.LogicalParent).Returns(parent.Object);

            var selector = new Selector().OfType<TestLogical1>().Descendent().OfType<TestLogical3>();

            Assert.IsTrue(ActivatorValue(selector, child.Object));
        }

        [TestMethod]
        public void Descendent_Matches_Control_When_It_Is_Descendent_OfType_And_Class()
        {
            var grandparent = new Mock<TestLogical1>();
            var parent = new Mock<TestLogical2>();
            var child = new Mock<TestLogical3>();

            grandparent.Setup(x => x.Classes).Returns(new Classes("foo"));
            parent.Setup(x => x.LogicalParent).Returns(grandparent.Object);
            parent.Setup(x => x.Classes).Returns(new Classes());
            child.Setup(x => x.LogicalParent).Returns(parent.Object);

            var selector = new Selector().OfType<TestLogical1>().Class("foo").Descendent().OfType<TestLogical3>();

            Assert.IsTrue(ActivatorValue(selector, child.Object));
        }

        [TestMethod]
        public void Descendent_Doesnt_Match_Control_When_It_Is_Descendent_OfType_But_Wrong_Class()
        {
            var grandparent = new Mock<TestLogical1>();
            var parent = new Mock<TestLogical2>();
            var child = new Mock<TestLogical3>();

            grandparent.Setup(x => x.Classes).Returns(new Classes("bar"));
            parent.Setup(x => x.LogicalParent).Returns(grandparent.Object);
            parent.Setup(x => x.Classes).Returns(new Classes("foo"));
            child.Setup(x => x.LogicalParent).Returns(parent.Object);

            var selector = new Selector().OfType<TestLogical1>().Class("foo").Descendent().OfType<TestLogical3>();

            Assert.IsFalse(ActivatorValue(selector, child.Object));
        }

        private static bool ActivatorValue(Match selector, IStyleable control)
        {
            return selector.GetActivator(control).Take(1).ToEnumerable().Single();
        }

        public abstract class TestLogical1 : TestLogical
        {
        }

        public abstract class TestLogical2 : TestLogical
        {
        }

        public abstract class TestLogical3 : TestLogical
        {
        }
    }
}